tan−1(43)\tan ^{-1}\left(\frac{4}{3}\right)tan−1(34)
tan−1(12)\tan ^{-1}\left(\frac{1}{2}\right)tan−1(21)
tan−1(1)\tan ^{-1}(1)tan−1(1)
tan−1(34)\tan ^{-1}\left(\frac{3}{4}\right)tan−1(43)